Wireless systems that carry delay-sensitive information (such as speech and/or video signals) typically transmit with fixed data rates, but may occasionally suffer from transmission outages caused by the random nature of the fading channels. If the transmitter has instantaneous channel state information (CSI) available, it can compensate for a significant portion of these outages by utilizing power allocation. In a conventional dual-hop bidirectional amplify-and-forward (AF) relaying system, the relay already has instantaneous CSI of both links available, as this is required for relay gain adjustment. We therefore develop an optimal power allocation strategy for the relay, which adjusts its instantaneous output power to the minimum level required to avoid outages, but only if the required output power is below some cutoff level; otherwise, the relay is silent in order to conserve power and prolong its lifetime. The proposed scheme is proven to minimize the system outage probability, subject to an average power constraint at the relay and fixed output powers at the end nodes.
|Title of host publication||GLOBECOM 2013 - 2013 IEEE Global Communications Conference|
|Subtitle of host publication||Atlanta, Georgia, USA; 9-13 December 2013|
|Place of Publication||Piscataway NJ USA|
|Publisher||IEEE, Institute of Electrical and Electronics Engineers|
|Number of pages||6|
|Publication status||Published - 2013|
|Event||IEEE Global Telecommunications Conference 2013 - Hilton Atlanta, Atlanta, United States of America|
Duration: 9 Dec 2013 → 13 Dec 2013
Conference number: 56th
|Workshop||IEEE Global Telecommunications Conference 2013|
|Abbreviated title||IEEE GLOBECOM 2013|
|Country||United States of America|
|Period||9/12/13 → 13/12/13|
|Other||Symposium held at IEEE Global Communications Conference 2013|
IEEE GLOBECOM is one of two flagship conferences of the IEEE Communications Society, together with IEEE ICC. Each year the conference attracts about 3000 submitted scientific papers. A technical program committee of more than 1,500 experts provides more than 10,000 reviews, and from this a small fraction of the submitted papers are accepted for publication and presentation at the conference. The conference meets once a year in North America and attracts roughly 2000 leading scientists and researchers and industry leaders from all around the world. IEEE GLOBECOM is therefore one of the most significant scientific events of the networking and communications community, a must-attend event for scientists and researchers from industry and academia.
IEEE GLOBECOM 2013 will feature 12 technical symposia. You are invited to submit to the symposia that best matches your topic. All but one of the symposia has its own call for papers and its own technical program committee. The only exception is the Selected Areas in Communications symposium, which is organized into nine tracks; each track has its own call for papers.